Ultrasound diagnostic apparatus and control method of ultrasound diagnostic apparatus

Abstract

An ultrasound diagnostic apparatus includes a display that displays a B-mode image in which at least a blood vessel region is imaged; a processor configured to accept designation of a position of the blood vessel region on the B-mode image; detect a vascular wall by performing image analysis on the B-mode image on the basis of the designated position of the blood vessel region; calculate a cross-sectional area of a blood vessel on the basis of the detected vascular wall; set a Doppler gate within the blood vessel region on the B-mode image on the basis of the detected vascular wall; calculate a blood flow velocity on the basis of Doppler data in the Doppler gate; and measure a blood flow volume on the basis of the cross-sectional area of the blood vessel and the blood flow velocity, and display a measurement result on the display.

What is claimed is: 
     
         1 . An ultrasound diagnostic apparatus comprising:
 a display configured to display a B-mode image in which at least a blood vessel region is imaged;   a processor configured to   accept designation point within the blood vessel region on the B-mode image, designated from a user,   upon accepting the designation point,
 acquire a blood vessel gradient, 
 set a gradient perpendicular line passing through the designation point and extending perpendicular to the blood vessel gradient, 
 set an upper reference point located shallower than the designation point and being on the gradient perpendicular line, 
 set an lower reference point located deeper than the designation point and being on the gradient perpendicular line, 
 detect an anterior vascular wall in a first range having the upper reference point as a center and having a predetermined first distance on the gradient perpendicular line, by performing image analysis on the B-mode image, 
 detect a posterior vascular wall in a second range having the lower reference point as a center and having a predetermined second distance on the gradient perpendicular line, by performing image analysis on the B-mode image, 
 calculate a cross-sectional area of a blood vessel on the basis of the anterior vascular wall and the posterior vascular wall, 
 set a Doppler gate within the blood vessel region on the B-mode image on the basis of the anterior vascular wall and the posterior vascular wall, 
 calculate a blood flow velocity on the basis of Doppler data in the Doppler gate, and 
 measure a blood flow volume on the basis of the cross-sectional area of the blood vessel and the blood flow velocity, and display a measurement result on the display. 
   
     
     
         2 . The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is configured to:   rotate the B-mode image by the blood vessel gradient such that the blood vessel region extends horizontally;   perform smoothing processing along a horizontal direction on the rotated B-mode image; and   detect the anterior vascular wall and the posterior vascular wall on the smoothed B-mode image.   
     
     
         3 . The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is configured to:   accept a modification of the blood vessel gradient by the user; and   detect again the anterior vascular wall and the posterior vascular wall based on the modified blood vessel gradient.   
     
     
         4 . The ultrasound diagnostic apparatus according to  claim 2 , the processor further configured to:
 wherein the processor is configured to:   accept a modification of the blood vessel gradient by the user; and   detect again the anterior vascular wall and the posterior vascular wall based on the modified blood vessel gradient.   
     
     
         5 . The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is configured to set the Doppler gate such that the Doppler gate is positioned on an inner side of the anterior vascular wall and the posterior vascular wall.   
     
     
         6 . The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is configured to set the Doppler gate such that the Doppler gate is positioned on an inner side of the anterior vascular wall and the posterior vascular wall.   
     
     
         7 . The ultrasound diagnostic apparatus according to  claim 3 ,
 wherein the processor is configured to set the Doppler gate such that the Doppler gate is positioned on an inner side of the anterior vascular wall and the posterior vascular wall.   
     
     
         8 . The ultrasound diagnostic apparatus according to  claim 4 ,
 wherein the processor is configured to set the Doppler gate such that the Doppler gate is positioned on an inner side of the anterior vascular wall and the posterior vascular wall.   
     
     
         9 . The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is configured to:   calculate an average blood flow velocity for one heartbeat period based on the blood flow velocity,   measure a blood flow volume based on the cross-sectional area of the blood vessel and the average blood flow velocity.   
     
     
         10 . The ultrasound diagnostic apparatus according to  claim 1 ,
 wherein the processor is configured to:   generate a Doppler waveform image based on the Doppler data in the Doppler gate; and   display the B-mode image and the Doppler waveform image.   
     
     
         11 . The ultrasound diagnostic apparatus according to  claim 2 ,
 wherein the processor is configured to:   generate a Doppler waveform image based on the Doppler data in the Doppler gate; and   display the B-mode image and the Doppler waveform image.   
     
     
         12 . The ultrasound diagnostic apparatus according to  claim 3 ,
 wherein the processor is configured to:   generate a Doppler waveform image based on the Doppler data in the Doppler gate; and   display the B-mode image and the Doppler waveform image.   
     
     
         13 . A control method of an ultrasound diagnostic apparatus, the control method comprising:
 displaying a B-mode image in which at least a blood vessel region is imaged;   accepting designation point within the blood vessel region on the B-mode image, designated from a user;   upon accepting the designation point,
 acquiring a blood vessel gradient; 
 setting a gradient perpendicular line passing through the designation point and extending perpendicular to the blood vessel gradient; 
 setting an upper reference point located shallower than the designation point and being on the gradient perpendicular line; 
 setting set an lower reference point located deeper than the designation point and being on the gradient perpendicular line; 
 detecting an anterior vascular wall in a first range having the upper reference point as a center and having a predetermined first distance on the gradient perpendicular line, by performing image analysis on the B-mode image; 
 detecting a posterior vascular wall in a second range having the lower reference point as a center and having a predetermined second distance on the gradient perpendicular line, by performing image analysis on the B-mode image; 
 calculating a cross-sectional area of a blood vessel on the basis of the detected anterior vascular wall and the detected posterior vascular wall; 
 setting a Doppler gate within the blood vessel region on the B-mode image on the basis of the detected anterior vascular wall and the detected posterior vascular wall; 
 calculating a blood flow velocity on the basis of Doppler data in the Doppler gate; and 
 measuring a blood flow volume on the basis of the calculated cross-sectional area of the blood vessel and the calculated blood flow velocity, and displaying a measurement result.